I think sorting out whether there is a specific use for one, or enough, is good. Or, whether is a specific use, but you still don’t like this particular cardigan but think the concept is worth “ upgrading “ —length, fabric, pockets.
I think your observation on proportions is very useful and I can relate. I’m very sensitive to proportions on myself, and come close to chucking things if I’m wearing the wrong pieces together. What is helpful for actually being able to make progress editing my wardrobe is , of course WEARING things, but even doing very intentional try- ons, a top or topper with a full array of bottoms or vice versa. If then nothing works even in try- on, it’s probably time to toss. Also if there’s only ONE outfit, that’s usually not good for me, with some exceptions for special occasions, funerals , depending on storage space and whether I want to try to upgrade with something more versatile.
I look not- good in most cardigans because I need more structure also- not for fomality but just my frame & how they hang. But I like to wear collared button- front shirts and yet don’t actually like how blazers look with them anymore. So a softer V - neck is better. I have 2 Athleta wool cardigans (I don’t think they have offered any more since the year I bought them) and really like how that works, but haven’t found a less-warm style that works the same.
Like Janet, I’m reaching more for hoodies also plus some kinds of HEWI or unicorn jackets that are a bit dressier/ less casual but not full- on blazers.